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(No ModeL) W. A. SHAW.

COMBINED ELECTRIC LIGHT AND GAS BURNER. No. 271,140. Patented Jan. 23,1883.

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Uwrrcn STATES PATENT @rrrca \VILLIAM A. SHAW, OF BROOKLYN, NEW YOBK.

COMBINED ELECTRIC LlGHT AND GAS-BURNER.

SPECIFICATION forming part of Letters Patent No. 271,140, dated January 2.3, 1883,

Application filed May 3, 1882. (No model.)

To all whom it may concern Be it known that I, WILLIAM A. SHAW, a citizen of the United States, residing in Brooklyn, in the county of Kings and State ofNew York, have invented a new and useful Gombined Electric Lightand Gas-Burner, ofwhich the following is a specification.

My invention relates to certain improvements in the art of producing artificial light.

The object of my invention is to combine a burner for ordinaryilluminating-gas with an electric lamp in such a manner as to utilize the heat developed in the incandescent electrode of the electric lamp for increasing the temperature of the illuminatinggas at or near the point of combustion.

It is well known that the luminous effects obtained by the combustion ofa given quantity of hydrocarbon gas are materially increased by previously heating the gas to a point considerably above its normal temperature.

My invention consists in combining with an ordinary gas-burner an incandescent electric conductor consisting of a carbon filament inclosed within a transparent globe in such a manner that the illuminating-gas is brought into contact with said filament, and thereby heated to such a temperature that an enhanced illuminating effect is obtained from the flame.

In the accompanyingdrawingsIhave shown a vertical section of a combined electric lamp and gas-burner embodying myimprovements, which consist in placing an incandescing earhon electrode within a transparent air-tight globe at a point between the gas-supply pipe and the burner.

Referring to .the drawing, A represents a gas tube or pipe of ordinary construction, provided with a stop-cock, a. Upon the upright extremity of this tube is mounted an electric lamp, B, having a base, 0, securely, attached to the gas-tube A and supporting a carbon filament, D, of any suitable form for producing light when rendered incandescent by passage therethrough of an electric current. A transparent globe, E, surrounds the electrode D and fits air-tight into a socket, 0, upon the base, 0. At the top of the transparent globe E is mounted a gas-burner, F, which may be of any suitable construction, but preferably consisting of a short metallic tube,f, fitted airtight to the globe E and communicating therewith. The burner F is provided with a jet, f, of any suitable construction, and also with a stop-cock, a. The service or inlet pipe A opens into the bottom of the globe E, which thus serves as a chamber to connect the gaspipe with the burnerF and to conduct the gas thereto.

The operation of this form of lamp is as follows: An electric generator being'connected with the wires 1 and 2, the electrode D becomes incandescent and emits light; in a wellknown manner. The gas-cocks a and a being both open, the gas passes through and fills the globe E, becoming heated while therein by contact with the electrode 1), after which it escapes at the jets of the burner B, and is there consumed, emitting a light of greatly-increased brilliancy by reason of its higher temperature.

The advantages arising from this form of construction areimportant. An incandescing conductor may be employed for producing the electric light Without inelosing the same Within a hermetically'sealed globe, for the reason that the hydrocarbon gas at all times completely fills the transparent chamber E, and thus prevents the access of oxygen to the incandescing conductor; hence the latter is not subjected to oxidation or combustion, but is merely rendered luminous. It has, however, beenfound practically impossible to prevent minute particles of carbon from being thrown off from the carbon conductor of incandescent electric lamps, and these particles collect in a form resembling dust or soot upon the inner surface of the globe, rendering the latter dingy in appearance and at the same time obscuring the light.

In the construction hereinbefore described it is obvious that the globe E may be readily removed and cleaned in the same manner as an ordinary lamp-chimney whenever necessary or desirable by reason of the deposit of carbon on its surface. For this reason I prefer. to make the joint at the bottom of the globe an air-tight joint, consisting of a rubber packing adapted to be tightly compressed against the edges of the globe and the base; but any suitable form of separable air-tight joint may be the incandescent electric conductor inclosed within said conduit, and the illuminating-gas burner attached to said conduit.

employed in lieu of the one described. WILLIAM A. SHAW. 5 What I claim as my invention is- Witnesses:

The combination, substantially as hereinbe- 1 CHARLES A. TERRY,

fore set forth, of the gas conduit or chamber, MILLER G. EARL. 

